Update README.md

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Author: Johan Dahlin

README.md

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 This code was downloaded from < https://github.com/compops/pmh-tutorial > or from < http://www.johandahlin.com/my-research/ > and contains the code used to produce the results in the tutorial
 
-* J. Dahlin and T. B. Schön, *Getting started with particle Metropolis-Hastings for inference in nonlinear models*. Pre-print, arXiv:1511:01707v1, 2015. 
+* J. Dahlin and T. B. Schön, *Getting started with particle Metropolis-Hastings for inference in nonlinear models*. Pre-print, arXiv:1511:01707, 2015. 
 
 The papers are available as a preprint from < http://arxiv.org/pdf/1511.01707 > and < http://www.johandahlin.com/my-research/ >.